uploading images;help again

[snowberry]

Hi Folks,
I am new to this forum and until I figure out how to upload images from my computer, I'm doomed. I created the new thread. I then did as advised and went to manage attachments. I selected the 3 images to upload. I clicked upload and it seemed to work but then came back with a message that said they weren't "a valid image file."I am just using jpegs. So, what am I doing wrong? Should I be resizing things? I see that there is an attachment key in the manage Attachments section, but it seems to be there for information only.